That's interesting.
I can't say I'm as sharp as I'd like to be in noticing, but if it seems iffy, tone is usually the give away for me. Grammar is pretty hard, as if there's no errors, I tend to think that as just well written.
Oddly, I once got flagged in a community for being potential Ai. I didn't think my grammar or even spelling is that hot. Must just be an uneasy phrasing, I'm not a natural writer, though I did teach language as a career.
Images are a point of interest at the moment, or images matched with text, which I guess is ubiquitously considered 'content' today. I'm convinced there's much more than I realized on popular social platforms that I seldom engage with.